Her weight has now been brought under 400kg since she arrived in Mumbai in early February.
Eman Ahmed Abd El Aty - who weighs 1,102 pounds - underwent a laparoscopic sleeve gastrectomy surgery led by Dr. Muffazal Lakdawala at Saifee Hospital in Mumbai Tuesday.
An Egyptian believed to be the world's heaviest woman has successfully undergone weight-loss surgery in India, doctors said Thursday. "The future course of action for the medical team working on her will be to correct all her associated medical problems, to get her fit enough to fly back to Egypt as soon as possible", it added.
Bed-ridden Eman Ahmed Abd El Aty had not left the house for more than two decades until she was flown to Mumbai last month for bariatric surgery.
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"Eman has lost more than 100 kilograms and her weight is gradually decreasing every day through medical treatment and follow-up", she told AFP.
The patient "is now fed with oral fluids and accepts them well".
After initially being denied a visa to travel to India, her doctor tweeted a plea directly to the country's foreign minister, who personally intervened.
For Ms Ahmed, the doctors hope to make her lose around 440 pounds in the next six months.
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Ms Abd El Aty arrived in Mumbai in February on a chartered plane, and was lifted by a crane into Saifee Hospital. According to the statement from hospital, "she had an uneventful surgery and anesthesia course".
The Egyptian is still believed to be the world's heaviest woman ahead of American Pauline Potter who the Guinness Book of World Records recorded at 293 kilos (645 pounds) in July previous year.
Eman was reportedly born with elephantiasis - a parasitic infection which causes extreme swelling in a person's limbs and arms.
Indian media reports suggested that Abd El Aty suffered stroke and faced a series of other ailments during the process, including high blood pressure, hypertension, diabetes and sleep deprivation. "We had to remove her gallbladder as well, as she had 15 stones", he said.
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Eman Ahmed, 36, once weighed 78 stone but was told to lose weight so that surgery could take place.